oops, it's a 900 SE Turbo.

I bet she's really pleased about your 'help'.

Graham

If you have not stepped on the brake, you are probably OK as the fluid
would sit in the reservoir. However, since tranny fluid is heavier
than brake fluid (at least that's my intuitive guess), it may have
settled. If you can suck all that fluid from the reservoir, then
replace it, it's probably OK...but I'd have the system flushed
completely.

A good shop will have a power system whereby they open the bleeders,
put the power system on the master, and push the fluid out, refilling
as they go. I'd want a good flushing done. Brake fluid contamination
is not a good thing.

Best bet is to completely flush out the brake system by doing a full bleed
of the brake lines using the correct type of brake fluid. If you end up
sacrificing some DOT-4 fluid to get all of the DOT-3 that's remaining out of
the lines that's certainly worth it since brakes are the #1 most important
system on a car. Doesn't matter how fast a car can go, but it does matter
whether or not it can stop effectively.

Craig.

AS others have said, it is unlikely the ATF has migrated into the
system, but best to flush the brake lines.

By the way, there is minimal dfference between DOT3 and DOT4 brake
fluid.  They are both glycol based fluids and can be mixed in a pinch.
The only real contamination would be having the ATF fluid in there.

DOT5 is where the fluid changes completely to a silicon base and is not
compatable with the earlier spec fluids.  And no, you do not want to use
DOT5 fluid.

you can also use dot 5.1 but not dot 5 as the latter is synthetic silicone
.Suck it out bleed it from the unions on the master cylinder and it should
be ok better still clean out all yyou can then bleed it through .